Silhouette 8.5 in. Portrait Cutting Mat - Standard TackThe 8. 5 in Portrait Cutting Mat is intended for use with the Silhouette Portrait4 to hold materials in place when sending jobs to the Silhouette machine. The mat has a regular adhesive level to hold most cardstock and general material types in place. The mat has a printed grid which coincides with a virtual on screen mat in the Silhouette Studio software for greater ease of use. This mat replaces is the regular cutting mat that is initially included